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We construct smooth 4-manifolds homeomorphic but not diffeomorphic to$CP^2#k\bar{CP^2},k \in {6,7,8,9}$, using the technique of rational blow-downalong Wahl type plumbing trees of spheres.Comment: 17 pages, 8 figures, v2: structural revision, accepted for  publication in Algebraic & Geometric Topolog

Rational blow-down along Wahl type plumbing trees of spheres